题目内容

【题目】根据第六次全国人口普查,我国人口增长处于低生育水平阶段,但人口数量仍然还是居高不下的原因主要是( )

A.人口基数太大B.青少年比重太低

C.人口素质下降D.城镇人口比重过高

【答案】A

【解析】

根据中华人民共和国成立后,由于人民生活水平的提高和医疗卫生条件的改善,人口死亡率大大下降,人口出生率不断上升,使我国人口迅速增长,进行分析解答。

20世纪70年代初期我国大力推行计划生育政策以来,全国大约少生了约4亿人,人口过快增长的势头得到有效遏制。特别是近十年来,我国的人口的出生率和自然增长率并不高。但是,由于我国人口基数大,青少年的比重高,在今后一段较长的时期内,人口总量还将持续增长。在度过高峰期后,人口总数才会呈下降趋势,但人口素质不高的状况在短期内还难以根本改变,人口与经济、社会、资源、环境的矛盾依然会十分突出。故选:A

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【题目】 March 21st is World Sleep Day. This year's slogan(口号)is “Healthy sleep, safe travel”. Its_____ is to let people know the importance of healthy sleep.

Sleep is like food for the brain, and enough sleep helps the body and brain grow and _____. According to the National Sleep Foundation in the US, adults need seven to nine hours of sleep every night. _____ students aged 10 to 17, a healthy sleep is about eight to nine hours per night.

But many students don't get enough sleep because of _____ school start time and heavy homework. About 80 percent of middle school students don't get enough sleep, the China Youth and Children Research Center reported. For some students, they want to sleep early, but they keep worrying about their schoolwork and can't_____ quickly. For others, they may even have insomnia(失眠)

These sleeping problems greatly affect people's life. Studies have shown that the lack of sleep for teenagers leads to poor _____. Students without enough_____ can't pay attention to class or do well in sports. Also, the lack of sleep may make them depressed.

_____, people should form good sleep habits. With good sleep habits, it is easier to fall asleep. Some of these good habits include _____ drinks that make people excited late at night, going to bed at the certain time each night, and sleeping in a ______ place that is dark, quiet and neither too warm nor too cold.

1A.suggestionB.goalC.influenceD.work

2A.developB.stopC.useD.change

3A.ForB.ToC.AsD.On

4A.lateB.slowC.earlyD.fast

5A.fall offB.fall asleepC.get upD.stay up

6A.mannersB.gradesC.mistakesD.tasks

7A.habitB.lifeC.waterD.sleep

8A.ThereforeB.MoreoverC.InsteadD.However

9A.allowingB.avoidingC.havingD.requiring

10A.noisyB.healthyC.cheapD.comfortable

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